David l



(No Model.)

, D. L. KELLY.

ROTARY PUMP.

Patented Mar. 31, 1885.

A UNITED STATES.

Barent- Om n.

DAVID L. KELLY, F BUFFALO, New; YORK- f ROTARY PUMP.

srmcrmcnrron forming part of eateries... no. 314,851, dated mm]. ennui- Application filed Jauuary5,1885. (No'modeL) l To all whom it may concern:

Be it known that I, DAvInL. KELLY, a subject of the Queen of Great Britain, residing in Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

My invention relates to that class of pumps where a flexible tube isuised for drawing and forcing the water or other fluid, and to certain details of construction; all of which will be fully and clearly hereinafter shown and described by reference to the accompanying drawings, in which- I Figure 1 is a vertical central cross-section. Fig. 2isavertical, longitudinal section through the pump, cutting through all except the main shaft and handleand the roller-shafts. Fig. 3

. is adetached side elevation of the flexible tube. Fig. 4 is an inside face'view of the head of the pump next to the handle, showing also an end view of the main shaft, the frame-work for supporting the rollers, and a pawl-andratchet movement for allowing "the water in the pump to go back when required. Fig. 5

.is a topview of the frame-work for supporting the rollers, the barrel upon which the framework is mounted, and a face view of the ratchet-wheel. Fig. 6is a cross-section through the flexible tube. Fig. 7 is a longitudinal elevation. Fig. 8 represents a transverse elevation of the pump complete; and Fig. 9 is a crosssection through a flexible tube, showing a modified construction of the same.

The bodya of the pump is usually inade of cast-iron; but it may be made of any suitable material adapted to the purpose. vided with a bearing or box, a, and with a cover, a, having an ordinary stuffing-box, a, through which the driving-shaft a passes, and is mounted in the bearings a'a. It is secured in place by ordinary bolts, a, and is provided with a crank, b, for operating it.

To the shaft 0. is rigidly secured by a key or other well-known means the barrel or drum 1;, having the frame-pieces b b, upon which are mounted the rollers b I). These rollers are kept up to their place by means of the split wedges or keys b, and are prevented from It is pro-' dropping out the other way by the circular flanges or rings 0 c. v

0' represents the ,flexible tube. It is provided with a peripheral flange, c, by which it is secured to theinterior of the pump between the shoulders c and the removable flange or ring 0. It is secured in place by means of bolts d, which are drawn up tightly so as to firmly clasp the flange a, and thereby hold the tube rigidly in place. It is also further secured bymeans of the short tubes d d, which screw into the body'of the pump, so as to hold it se- I curely in place, as shown, (see Figs. 1 and 2,) the flexible tube being firmlysecured to .,the tubes d'or d? by means of a wire or cord, 11. V

I em loy rubber as being a suitablematerial for t e tubes 0, and their form incross-sec tion is similar to that shown in Fig. 6. The interior grooves, d and outwardly-projecting ridged prevent the breaking or splitting'of the rubber by the continued flattening and 0 springing out "of the tube as the rollers pass over it while operating the pump.

In Fig. 9 I have shown a modified construction of the flexible tube, consisting of strips of leather either sewed or riveted together by rivets d -The flange c is produced by folding one side, as shown, and riveting or sewing it together at or about the point e.

To insure the springing out of the sides of the tube after the rollers have passed over it,

I employ a diaphragm of rubber or other equivalent elastic material, e, which, by ,its elastic force, causes the sides of the tube to spring out, as shown.

In order to use a light flexible tube and 8 insure it springing out with sufiicient force, I produce a vacuum within the body or space e by means of the openings e, which comm.u-- nicate with the inlet-tube, as shown, and also with the space e. As a result of this con- 0 struction, the moment the pump is put in operation a vacuum is produced in both the tube leading to the water or fluid to be drawn and in the space or chamber e, thereby taking the atmospheric pressure ofl from the out- 5 side of the flexible tube as well as from the inside. By this means the tube, even if very light, will be allowed to spring out without obstructionas the rollers which compress it) [should leak into the casing or chamber? pass over it. Were it no for this construction ayacunm produced onthe inside of the tube only would tend to collapse it and hold it,-together as long as a vacuum was maintained. The ratchet-wheels (see Figs. 4 and 5) and pivotedpawl e, which is pivoted by a pin, f,'prevent the pump from being turned backward; but in cold weather,when there is danger of freezing, the pawl may be lifted up away from the ratchet by means of the eccentrio f, which is connected bya pin passing through the head of the pumpto the outside,' where a handle or crank, f is rigidly secured to it, so, that the eccentric may be turned so as tiffeither engage the end of the pawl with the ratchet or disengage it for the purpose above mentioned.

The operation of the pump is as follows: By turning the crank the rollers will pass over and compress the flexible tube, thereby h forcing the air out from the discharge-pipe,

fluid rises into the flexible tube.

-the pressure meanwhile equalizing itself in the suction end of the tube and in the chainiber .e inside of the casing or pump, followed by a corresponding 'rise'of the fluid in the suction-pipe. The operation proceedsu ntil the The pump is now in full action on the fluid. If anyair through the .stuffing-box, or otherwise, there will be a rise of pressure in the chamber and a corresponding fall in the suction-pipe of the fluid; During the passage of the rollers onto the suction'end of the flexible tube there will be a stoppage of flow momentarily of the fluid, in which case the casing will act as an-air-vessel, which subdues the shocks and equalizes the flow in-the suction-pipe. In some cases the flange c or its equivalent may be dispensed with and thetube secured only at the ends; but it would not answer the purpose quite so well.

I claim as my invention- A pumphaving the flexible tube secured within the casing, rollers and shaft for operating it, substantially'as specified, and an airspace within the pump outside of the flexible tube, in combination with one or more perforations leading from the suctiontube to=the air chamber, whereby an equal vacuum is formed and maintained in the air-chamber and inlet and flexible tube while the pump is.

in operation.

' DAVID L. KELLY.v

Witnesses:

'JENNIE M. CALDWELL,

J AMES SANGSTER. 

